What’s the Difference Between Stock Class and Open Class Pump Paintball?

Within the stock class pump paintball world, there are two primary classifications for pump paintball guns. Those are Stock Class and Open Class. Simply put, Stock class will only use 12 gram CO2 cartridges and a 10 round feed tube while open class can use both tanks and hoppers.

There is an in between classification called Modified Stock Class. This is basically swapping either the 12 grams CO2 cartridge adapter with an air tank adapter or the 10 round feed tube with a 50 round hopper.


What Is Stock Class Paintball?

Stock Class Paintball is a style of play focused on the fundamental skills of a players paintball like movement, teamwork, and aiming rather than rate of fire to win. The paintball guns are more restrictive as pump action and they must be cocked back after each shot.

For a long time most players will identify a stock class paintball gun setup as a pump action marker that uses a 10-15 round feed that is parallel to the body and runs on 12 gram CO2 cartridges that must be unscrewed to change using a 12 gram adapter. Upgrades such as pump assists, lever change 12 grams, or spring feeds do not count.


The Original Stock Class Rules and Restrictions

The original definition of a stock class pump gun was a little more restrictive. No porting was allowed on the barrel and there was a limit to how long the barrel extension could be.  The rules were adapted to allow exceptions to the changing technology as the game evolved and new gear became readily available in the stockclass world.

Before the adaptations of the new rules stock class pump guns like CCI Phantoms, Carters, Gargoyles and most stock class configured Autocockers and also Sterlings would not at the time been originally accepted as stock class.

With all that said this made the original stock class markers like the Sheridan PGP, Nelspot 007, PMI-1, KP Rifles and P68SC as your primary go to stock class setups. Of course this was a bit frustrating sense this did not leave much variety to choose from and the newer pump markers that the stock class players wanted had features banning them from stock class rules.


What Counts as Open Class Paintball?

Open Class Pump Paintball is any pump paintball marker that includes a tank and loader. The only rule for open class pump paintball is that it is a pump action marker.


Most stock class pump players use an open class style pump gun sense they are commonly available and easier to get used to. Unlike stock class, open class allows for all types of air sources like constant air tanks and lever changers. They allow for spring feeds, vertical feed sticks, and hoppers as a way to feed paintballs to the gun.

What is Modified Stock Class Paintball?

Modified Stock Class is considered an in between classification for Stock Class and Open Class. With so many different ways to configure a Modified Stock Class gun that it would be hard to define accurately exactly what a setup would look like. They usually combines aspects from both two classifications and/or uses spring feeds, lever changers, and auto-triggers.



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